@astronautlabs/jsonpath

/* Copyright (C) 2013 Ariya Hidayat <ariya.hidayat@gmail.com> Copyright (C) 2013 Thaddee Tyl <thaddee.tyl@gmail.com> Copyright (C) 2013 Mathias Bynens <mathias@qiwi.be> Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com> Copyright (C) 2012 Mathias Bynens <mathias@qiwi.be> Copyright (C) 2012 Joost-Wim Boekesteijn <joost-wim@boekesteijn.nl> Copyright (C) 2012 Kris Kowal <kris.kowal@cixar.com> Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com> Copyright (C) 2012 Arpad Borsos <arpad.borsos@googlemail.com> Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@gmail.com> Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /*jslint bitwise:true plusplus:true */ /*global esprima:true, define:true, exports:true, window: true, throwErrorTolerant: true, throwError: true, generateStatement: true, peek: true, parseAssignmentExpression: true, parseBlock: true, parseExpression: true, parseFunctionDeclaration: true, parseFunctionExpression: true, parseFunctionSourceElements: true, parseVariableIdentifier: true, parseLeftHandSideExpression: true, parseUnaryExpression: true, parseStatement: true, parseSourceElement: true */ var Token, TokenName, FnExprTokens, PropertyKind, Messages, Regex, SyntaxTreeDelegate, source, strict, index, lineNumber, lineStart, length, delegate, lookahead, state, extra; Token = { BooleanLiteral: 1, EOF: 2, Identifier: 3, Keyword: 4, NullLiteral: 5, NumericLiteral: 6, Punctuator: 7, StringLiteral: 8, RegularExpression: 9 }; TokenName = {}; TokenName[Token.BooleanLiteral] = 'Boolean'; TokenName[Token.EOF] = '<end>'; TokenName[Token.Identifier] = 'Identifier'; TokenName[Token.Keyword] = 'Keyword'; TokenName[Token.NullLiteral] = 'Null'; TokenName[Token.NumericLiteral] = 'Numeric'; TokenName[Token.Punctuator] = 'Punctuator'; TokenName[Token.StringLiteral] = 'String'; TokenName[Token.RegularExpression] = 'RegularExpression'; // A function following one of those tokens is an expression. FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new', 'return', 'case', 'delete', 'throw', 'void', // assignment operators '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=', '&=', '|=', '^=', ',', // binary/unary operators '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&', '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=', '<=', '<', '>', '!=', '!==']; export const Syntax = { AssignmentExpression: 'AssignmentExpression', ArrayExpression: 'ArrayExpression', BlockStatement: 'BlockStatement', BinaryExpression: 'BinaryExpression', BreakStatement: 'BreakStatement', CallExpression: 'CallExpression', CatchClause: 'CatchClause', ConditionalExpression: 'ConditionalExpression', ContinueStatement: 'ContinueStatement', DoWhileStatement: 'DoWhileStatement', DebuggerStatement: 'DebuggerStatement', EmptyStatement: 'EmptyStatement', ExpressionStatement: 'ExpressionStatement', ForStatement: 'ForStatement', ForInStatement: 'ForInStatement', FunctionDeclaration: 'FunctionDeclaration', FunctionExpression: 'FunctionExpression', Identifier: 'Identifier', IfStatement: 'IfStatement', Literal: 'Literal', LabeledStatement: 'LabeledStatement', LogicalExpression: 'LogicalExpression', MemberExpression: 'MemberExpression', NewExpression: 'NewExpression', ObjectExpression: 'ObjectExpression', Program: 'Program', Property: 'Property', ReturnStatement: 'ReturnStatement', SequenceExpression: 'SequenceExpression', SwitchStatement: 'SwitchStatement', SwitchCase: 'SwitchCase', ThisExpression: 'ThisExpression', ThrowStatement: 'ThrowStatement', TryStatement: 'TryStatement', UnaryExpression: 'UnaryExpression', UpdateExpression: 'UpdateExpression', VariableDeclaration: 'VariableDeclaration', VariableDeclarator: 'VariableDeclarator', WhileStatement: 'WhileStatement', WithStatement: 'WithStatement' }; PropertyKind = { Data: 1, Get: 2, Set: 4 }; // Error messages should be identical to V8. Messages = { UnexpectedToken: 'Unexpected token %0', UnexpectedNumber: 'Unexpected number', UnexpectedString: 'Unexpected string', UnexpectedIdentifier: 'Unexpected identifier', UnexpectedReserved: 'Unexpected reserved word', UnexpectedEOS: 'Unexpected end of input', NewlineAfterThrow: 'Illegal newline after throw', InvalidRegExp: 'Invalid regular expression', UnterminatedRegExp: 'Invalid regular expression: missing /', InvalidLHSInAssignment: 'Invalid left-hand side in assignment', InvalidLHSInForIn: 'Invalid left-hand side in for-in', MultipleDefaultsInSwitch: 'More than one default clause in switch statement', NoCatchOrFinally: 'Missing catch or finally after try', UnknownLabel: 'Undefined label \'%0\'', Redeclaration: '%0 \'%1\' has already been declared', IllegalContinue: 'Illegal continue statement', IllegalBreak: 'Illegal break statement', IllegalReturn: 'Illegal return statement', StrictModeWith: 'Strict mode code may not include a with statement', StrictCatchVariable: 'Catch variable may not be eval or arguments in strict mode', StrictVarName: 'Variable name may not be eval or arguments in strict mode', StrictParamName: 'Parameter name eval or arguments is not allowed in strict mode', StrictParamDupe: 'Strict mode function may not have duplicate parameter names', StrictFunctionName: 'Function name may not be eval or arguments in strict mode', StrictOctalLiteral: 'Octal literals are not allowed in strict mode.', StrictDelete: 'Delete of an unqualified identifier in strict mode.', StrictDuplicateProperty: 'Duplicate data property in object literal not allowed in strict mode', AccessorDataProperty: 'Object literal may not have data and accessor property with the same name', AccessorGetSet: 'Object literal may not have multiple get/set accessors with the same name', StrictLHSAssignment: 'Assignment to eval or arguments is not allowed in strict mode', StrictLHSPostfix: 'Postfix increment/decrement may not have eval or arguments operand in strict mode', StrictLHSPrefix: 'Prefix increment/decrement may not have eval or arguments operand in strict mode', StrictReservedWord: 'Use of future reserved word in strict mode' }; // See also tools/generate-unicode-regex.py. Regex = { NonAsciiIdentifierStart: new 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NonAsciiIdentifierPart: new 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}; // Ensure the condition is true, otherwise throw an error. // This is only to have a better contract semantic, i.e. another safety net // to catch a logic error. The condition shall be fulfilled in normal case. // Do NOT use this to enforce a certain condition on any user input. function assert(condition, message) { /* istanbul ignore if */ if (!condition) { throw new Error('ASSERT: ' + message); } } function isDecimalDigit(ch) { return (ch >= 48 && ch <= 57); // 0..9 } function isHexDigit(ch) { return '0123456789abcdefABCDEF'.indexOf(ch) >= 0; } function isOctalDigit(ch) { return '01234567'.indexOf(ch) >= 0; } // 7.2 White Space function isWhiteSpace(ch) { return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) || (ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0); } // 7.3 Line Terminators function isLineTerminator(ch) { return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029); } // 7.6 Identifier Names and Identifiers function isIdentifierStart(ch) { return (ch == 0x40) || // @ (for jsonpath) (ch === 0x24) || (ch === 0x5F) || // $ (dollar) and _ (underscore) (ch >= 0x41 && ch <= 0x5A) || // A..Z (ch >= 0x61 && ch <= 0x7A) || // a..z (ch === 0x5C) || // \ (backslash) ((ch >= 0x80) && Regex.NonAsciiIdentifierStart.test(String.fromCharCode(ch))); } function isIdentifierPart(ch) { return (ch === 0x24) || (ch === 0x5F) || // $ (dollar) and _ (underscore) (ch >= 0x41 && ch <= 0x5A) || // A..Z (ch >= 0x61 && ch <= 0x7A) || // a..z (ch >= 0x30 && ch <= 0x39) || // 0..9 (ch === 0x5C) || // \ (backslash) ((ch >= 0x80) && Regex.NonAsciiIdentifierPart.test(String.fromCharCode(ch))); } // 7.6.1.2 Future Reserved Words function isFutureReservedWord(id) { switch (id) { case 'class': case 'enum': case 'export': case 'extends': case 'import': case 'super': return true; default: return false; } } function isStrictModeReservedWord(id) { switch (id) { case 'implements': case 'interface': case 'package': case 'private': case 'protected': case 'public': case 'static': case 'yield': case 'let': return true; default: return false; } } function isRestrictedWord(id) { return id === 'eval' || id === 'arguments'; } // 7.6.1.1 Keywords function isKeyword(id) { if (strict && isStrictModeReservedWord(id)) { return true; } // 'const' is specialized as Keyword in V8. // 'yield' and 'let' are for compatiblity with SpiderMonkey and ES.next. // Some others are from future reserved words. switch (id.length) { case 2: return (id === 'if') || (id === 'in') || (id === 'do'); case 3: return (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try') || (id === 'let'); case 4: return (id === 'this') || (id === 'else') || (id === 'case') || (id === 'void') || (id === 'with') || (id === 'enum'); case 5: return (id === 'while') || (id === 'break') || (id === 'catch') || (id === 'throw') || (id === 'const') || (id === 'yield') || (id === 'class') || (id === 'super'); case 6: return (id === 'return') || (id === 'typeof') || (id === 'delete') || (id === 'switch') || (id === 'export') || (id === 'import'); case 7: return (id === 'default') || (id === 'finally') || (id === 'extends'); case 8: return (id === 'function') || (id === 'continue') || (id === 'debugger'); case 10: return (id === 'instanceof'); default: return false; } } // 7.4 Comments function addComment(type, value, start, end, loc) { var comment, attacher; assert(typeof start === 'number', 'Comment must have valid position'); // Because the way the actual token is scanned, often the comments // (if any) are skipped twice during the lexical analysis. // Thus, we need to skip adding a comment if the comment array already // handled it. if (state.lastCommentStart >= start) { return; } state.lastCommentStart = start; comment = { type: type, value: value }; if (extra.range) { comment.range = [start, end]; } if (extra.loc) { comment.loc = loc; } extra.comments.push(comment); if (extra.attachComment) { extra.leadingComments.push(comment); extra.trailingComments.push(comment); } } function skipSingleLineComment(offset) { var start, loc, ch, comment; start = index - offset; loc = { start: { line: lineNumber, column: index - lineStart - offset } }; while (index < length) { ch = source.charCodeAt(index); ++index; if (isLineTerminator(ch)) { if (extra.comments) { comment = source.slice(start + offset, index - 1); loc.end = { line: lineNumber, column: index - lineStart - 1 }; addComment('Line', comment, start, index - 1, loc); } if (ch === 13 && source.charCodeAt(index) === 10) { ++index; } ++lineNumber; lineStart = index; return; } } if (extra.comments) { comment = source.slice(start + offset, index); loc.end = { line: lineNumber, column: index - lineStart }; addComment('Line', comment, start, index, loc); } } function skipMultiLineComment() { var start, loc, ch, comment; if (extra.comments) { start = index - 2; loc = { start: { line: lineNumber, column: index - lineStart - 2 } }; } while (index < length) { ch = source.charCodeAt(index); if (isLineTerminator(ch)) { if (ch === 0x0D && source.charCodeAt(index + 1) === 0x0A) { ++index; } ++lineNumber; ++index; lineStart = index; if (index >= length) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } } else if (ch === 0x2A) { // Block comment ends with '*/'. if (source.charCodeAt(index + 1) === 0x2F) { ++index; ++index; if (extra.comments) { comment = source.slice(start + 2, index - 2); loc.end = { line: lineNumber, column: index - lineStart }; addComment('Block', comment, start, index, loc); } return; } ++index; } else { ++index; } } throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } function skipComment() { var ch, start; start = (index === 0); while (index < length) { ch = source.charCodeAt(index); if (isWhiteSpace(ch)) { ++index; } else if (isLineTerminator(ch)) { ++index; if (ch === 0x0D && source.charCodeAt(index) === 0x0A) { ++index; } ++lineNumber; lineStart = index; start = true; } else if (ch === 0x2F) { // U+002F is '/' ch = source.charCodeAt(index + 1); if (ch === 0x2F) { ++index; ++index; skipSingleLineComment(2); start = true; } else if (ch === 0x2A) { // U+002A is '*' ++index; ++index; skipMultiLineComment(); } else { break; } } else if (start && ch === 0x2D) { // U+002D is '-' // U+003E is '>' if ((source.charCodeAt(index + 1) === 0x2D) && (source.charCodeAt(index + 2) === 0x3E)) { // '-->' is a single-line comment index += 3; skipSingleLineComment(3); } else { break; } } else if (ch === 0x3C) { // U+003C is '<' if (source.slice(index + 1, index + 4) === '!--') { ++index; // `<` ++index; // `!` ++index; // `-` ++index; // `-` skipSingleLineComment(4); } else { break; } } else { break; } } } function scanHexEscape(prefix) { var i, len, ch, code = 0; len = (prefix === 'u') ? 4 : 2; for (i = 0; i < len; ++i) { if (index < length && isHexDigit(source[index])) { ch = source[index++]; code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase()); } else { return ''; } } return String.fromCharCode(code); } function getEscapedIdentifier() { var ch, id; ch = source.charCodeAt(index++); id = String.fromCharCode(ch); // '\u' (U+005C, U+0075) denotes an escaped character. if (ch === 0x5C) { if (source.charCodeAt(index) !== 0x75) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } ++index; ch = scanHexEscape('u'); if (!ch || ch === '\\' || !isIdentifierStart(ch.charCodeAt(0))) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } id = ch; } while (index < length) { ch = source.charCodeAt(index); if (!isIdentifierPart(ch)) { break; } ++index; id += String.fromCharCode(ch); // '\u' (U+005C, U+0075) denotes an escaped character. if (ch === 0x5C) { id = id.substr(0, id.length - 1); if (source.charCodeAt(index) !== 0x75) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } ++index; ch = scanHexEscape('u'); if (!ch || ch === '\\' || !isIdentifierPart(ch.charCodeAt(0))) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } id += ch; } } return id; } function getIdentifier() { var start, ch; start = index++; while (index < length) { ch = source.charCodeAt(index); if (ch === 0x5C) { // Blackslash (U+005C) marks Unicode escape sequence. index = start; return getEscapedIdentifier(); } if (isIdentifierPart(ch)) { ++index; } else { break; } } return source.slice(start, index); } function scanIdentifier() { var start, id, type; start = index; // Backslash (U+005C) starts an escaped character. id = (source.charCodeAt(index) === 0x5C) ? getEscapedIdentifier() : getIdentifier(); // There is no keyword or literal with only one character. // Thus, it must be an identifier. if (id.length === 1) { type = Token.Identifier; } else if (isKeyword(id)) { type = Token.Keyword; } else if (id === 'null') { type = Token.NullLiteral; } else if (id === 'true' || id === 'false') { type = Token.BooleanLiteral; } else { type = Token.Identifier; } return { type: type, value: id, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } // 7.7 Punctuators function scanPunctuator() { var start = index, code = source.charCodeAt(index), code2, ch1 = source[index], ch2, ch3, ch4; switch (code) { // Check for most common single-character punctuators. case 0x2E: // . dot case 0x28: // ( open bracket case 0x29: // ) close bracket case 0x3B: // ; semicolon case 0x2C: // , comma case 0x7B: // { open curly brace case 0x7D: // } close curly brace case 0x5B: // [ case 0x5D: // ] case 0x3A: // : case 0x3F: // ? case 0x7E: // ~ ++index; if (extra.tokenize) { if (code === 0x28) { extra.openParenToken = extra.tokens.length; } else if (code === 0x7B) { extra.openCurlyToken = extra.tokens.length; } } return { type: Token.Punctuator, value: String.fromCharCode(code), lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; default: code2 = source.charCodeAt(index + 1); // '=' (U+003D) marks an assignment or comparison operator. if (code2 === 0x3D) { switch (code) { case 0x2B: // + case 0x2D: // - case 0x2F: // / case 0x3C: // < case 0x3E: // > case 0x5E: // ^ case 0x7C: // | case 0x25: // % case 0x26: // & case 0x2A: // * index += 2; return { type: Token.Punctuator, value: String.fromCharCode(code) + String.fromCharCode(code2), lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; case 0x21: // ! case 0x3D: // = index += 2; // !== and === if (source.charCodeAt(index) === 0x3D) { ++index; } return { type: Token.Punctuator, value: source.slice(start, index), lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } } } // 4-character punctuator: >>>= ch4 = source.substr(index, 4); if (ch4 === '>>>=') { index += 4; return { type: Token.Punctuator, value: ch4, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } // 3-character punctuators: === !== >>> <<= >>= ch3 = ch4.substr(0, 3); if (ch3 === '>>>' || ch3 === '<<=' || ch3 === '>>=') { index += 3; return { type: Token.Punctuator, value: ch3, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } // Other 2-character punctuators: ++ -- << >> && || ch2 = ch3.substr(0, 2); if ((ch1 === ch2[1] && ('+-<>&|'.indexOf(ch1) >= 0)) || ch2 === '=>') { index += 2; return { type: Token.Punctuator, value: ch2, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } // 1-character punctuators: < > = ! + - * % & | ^ / if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) { ++index; return { type: Token.Punctuator, value: ch1, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } // 7.8.3 Numeric Literals function scanHexLiteral(start) { var number = ''; while (index < length) { if (!isHexDigit(source[index])) { break; } number += source[index++]; } if (number.length === 0) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } if (isIdentifierStart(source.charCodeAt(index))) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } return { type: Token.NumericLiteral, value: parseInt('0x' + number, 16), lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } function scanOctalLiteral(start) { var number = '0' + source[index++]; while (index < length) { if (!isOctalDigit(source[index])) { break; } number += source[index++]; } if (isIdentifierStart(source.charCodeAt(index)) || isDecimalDigit(source.charCodeAt(index))) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } return { type: Token.NumericLiteral, value: parseInt(number, 8), octal: true, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } function scanNumericLiteral() { var number, start, ch; ch = source[index]; assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'), 'Numeric literal must start with a decimal digit or a decimal point'); start = index; number = ''; if (ch !== '.') { number = source[index++]; ch = source[index]; // Hex number starts with '0x'. // Octal number starts with '0'. if (number === '0') { if (ch === 'x' || ch === 'X') { ++index; return scanHexLiteral(start); } if (isOctalDigit(ch)) { return scanOctalLiteral(start); } // decimal number starts with '0' such as '09' is illegal. if (ch && isDecimalDigit(ch.charCodeAt(0))) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } } while (isDecimalDigit(source.charCodeAt(index))) { number += source[index++]; } ch = source[index]; } if (ch === '.') { number += source[index++]; while (isDecimalDigit(source.charCodeAt(index))) { number += source[index++]; } ch = source[index]; } if (ch === 'e' || ch === 'E') { number += source[index++]; ch = source[index]; if (ch === '+' || ch === '-') { number += source[index++]; } if (isDecimalDigit(source.charCodeAt(index))) { while (isDecimalDigit(source.charCodeAt(index))) { number += source[index++]; } } else { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } } if (isIdentifierStart(source.charCodeAt(index))) { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } return { type: Token.NumericLiteral, value: parseFloat(number), lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } // 7.8.4 String Literals function scanStringLiteral() { var str = '', quote, start, ch, code, unescaped, restore, octal = false, startLineNumber, startLineStart; startLineNumber = lineNumber; startLineStart = lineStart; quote = source[index]; assert((quote === '\'' || quote === '"'), 'String literal must starts with a quote'); start = index; ++index; while (index < length) { ch = source[index++]; if (ch === quote) { quote = ''; break; } else if (ch === '\\') { ch = source[index++]; if (!ch || !isLineTerminator(ch.charCodeAt(0))) { switch (ch) { case 'u': case 'x': restore = index; unescaped = scanHexEscape(ch); if (unescaped) { str += unescaped; } else { index = restore; str += ch; } break; case 'n': str += '\n'; break; case 'r': str += '\r'; break; case 't': str += '\t'; break; case 'b': str += '\b'; break; case 'f': str += '\f'; break; case 'v': str += '\x0B'; break; default: if (isOctalDigit(ch)) { code = '01234567'.indexOf(ch); // \0 is not octal escape sequence if (code !== 0) { octal = true; } if (index < length && isOctalDigit(source[index])) { octal = true; code = code * 8 + '01234567'.indexOf(source[index++]); // 3 digits are only allowed when string starts // with 0, 1, 2, 3 if ('0123'.indexOf(ch) >= 0 && index < length && isOctalDigit(source[index])) { code = code * 8 + '01234567'.indexOf(source[index++]); } } str += String.fromCharCode(code); } else { str += ch; } break; } } else { ++lineNumber; if (ch === '\r' && source[index] === '\n') { ++index; } lineStart = index; } } else if (isLineTerminator(ch.charCodeAt(0))) { break; } else { str += ch; } } if (quote !== '') { throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); } return { type: Token.StringLiteral, value: str, octal: octal, startLineNumber: startLineNumber, startLineStart: startLineStart, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } function testRegExp(pattern, flags) { var value; try { value = new RegExp(pattern, flags); } catch (e) { throwError({}, Messages.InvalidRegExp); } return value; } function scanRegExpBody() { var ch, str, classMarker, terminated, body; ch = source[index]; assert(ch === '/', 'Regular expression literal must start with a slash'); str = source[index++]; classMarker = false; terminated = false; while (index < length) { ch = source[index++]; str += ch; if (ch === '\\') { ch = source[index++]; // ECMA-262 7.8.5 if (isLineTerminator(ch.charCodeAt(0))) { throwError({}, Messages.UnterminatedRegExp); } str += ch; } else if (isLineTerminator(ch.charCodeAt(0))) { throwError({}, Messages.UnterminatedRegExp); } else if (classMarker) { if (ch === ']') { classMarker = false; } } else { if (ch === '/') { terminated = true; break; } else if (ch === '[') { classMarker = true; } } } if (!terminated) { throwError({}, Messages.UnterminatedRegExp); } // Exclude leading and trailing slash. body = str.substr(1, str.length - 2); return { value: body, literal: str }; } function scanRegExpFlags() { var ch, str, flags, restore; str = ''; flags = ''; while (index < length) { ch = source[index]; if (!isIdentifierPart(ch.charCodeAt(0))) { break; } ++index; if (ch === '\\' && index < length) { ch = source[index]; if (ch === 'u') { ++index; restore = index; ch = scanHexEscape('u'); if (ch) { flags += ch; for (str += '\\u'; restore < index; ++restore) { str += source[restore]; } } else { index = restore; flags += 'u'; str += '\\u'; } throwErrorTolerant({}, Messages.UnexpectedToken, 'ILLEGAL'); } else { str += '\\'; throwErrorTolerant({}, Messages.UnexpectedToken, 'ILLEGAL'); } } else { flags += ch; str += ch; } } return { value: flags, literal: str }; } function scanRegExp() { var start, body, flags, pattern, value; lookahead = null; skipComment(); start = index; body = scanRegExpBody(); flags = scanRegExpFlags(); value = testRegExp(body.value, flags.value); if (extra.tokenize) { return { type: Token.RegularExpression, value: value, lineNumber: lineNumber, lineStart: lineStart, start: start, end: index }; } return { literal: body.literal + flags.literal, value: value, start: start, end: index }; } function collectRegex() { var pos, loc, regex, token; skipComment(); pos = index; loc = { start: { line: lineNumber, column: index - lineStart } }; regex = scanRegExp(); loc.end = { line: lineNumber, column: index - lineStart }; /* istanbul ignore next */ if (!extra.tokenize) { // Pop the previous token, which is likely '/' or '/=' if (extra.tokens.length > 0) { token = extra.tokens[extra.tokens.length - 1]; if (token.range[0] === pos && token.type === 'Punctuator') { if (token.value === '/' || token.value === '/=') { extra.tokens.pop(); } } } extra.tokens.push({ type: 'RegularExpression', value: regex.literal, range: [pos, index], loc: loc }); } return regex; } function isIdentifierName(token) { return token.type === Token.Identifier || token.type === Token.Keyword || token.type === Token.BooleanLiteral || token.type === Token.NullLiteral; } function advanceSlash() { var prevToken, checkToken; // Using the following algorithm: // https://github.com/mozilla/sweet.js/wiki/design prevToken = extra.tokens[extra.tokens.length - 1]; if (!prevToken) { // Nothing before that: it cannot be a division. return collectRegex(); } if (prevToken.type === 'Punctuator') { if (prevToken.value === ']') { return scanPunctuator(); } if (prevToken.value === ')') { checkToken = extra.tokens[extra.openParenToken - 1]; if (checkToken && checkToken.type === 'Keyword' && (checkToken.value === 'if' || checkToken.value === 'while' || checkToken.value === 'for' || checkToken.value === 'with')) { return collectRegex(); } return scanPunctuator(); } if (prevToken.value === '}') { // Dividing a function by anything makes little sense, // but we have to check for that. if (extra.tokens[extra.openCurlyToken - 3] && extra.tokens[extra.openCurlyToken - 3].type === 'Keyword') { // Anonymous function. checkToken = extra.tokens[extra.openCurlyToken - 4]; if (!checkToken) { return scanPunctuator(); } } else if (extra.tokens[extra.openCurlyToken - 4] && extra.tokens[extra.openCurlyToken - 4].type === 'Keyword') { // Named function. checkToken = extra.tokens[extra.openCurlyToken - 5]; if (!checkToken) { return collectRegex(); } } else { return scanPunctuator(); } // checkToken determines whether the function is // a declaration or an expression. if (FnExprTokens.indexOf(checkToken.value) >= 0) { // It is an expression. return scanPunctuator(); } // It is a declaration. return collectRegex(); } return collectRegex(); } if (prevToken.type === 'Keyword') { return collectRegex(); } return scanPunctuator(); } function advance() { var ch; skipComment(); if (index >= length) { return { type: Token.EOF, lineNumber: lineNumber, lineStart: lineStart, start: index, end: index }; } ch = source.charCodeAt(index); if (isIdentifierStart(ch)) { return scanIdentifier(); } // Very common: ( and ) and ; if (ch === 0x28 || ch === 0x29 || ch === 0x3B) { return scanPunctuator(); } // String literal starts with single quote (U+0027) or double quote (U+0022). if (ch === 0x27 || ch === 0x22) { return scanStringLiteral(); } // Dot (.) U+002E can also start a floating-point number, hence the need // to check the next character. if (ch === 0x2E) { if (isDecimalDigit(source.charCodeAt(index + 1))) { return scanNumericLiteral(); } return scanPunctuator(); } if (isDecimalDigit(ch)) { return scanNumericLiteral(); } // Slash (/) U+002F can also start a regex. if (extra.tokenize && ch === 0x2F) { return advanceSlash(); } return scanPunctuator(); } function collectToken() { var loc, token, range, value; skipComment(); loc = { start: { line: lineNumber, column: index - lineStart } }; token = advance(); loc.end = { line: lineNumber, column: index - lineStart }; if (token.type !== Token.EOF) { value = source.slice(token.start, token.end); extra.tokens.push({ type: TokenName[token.type], value: value, range: [token.start, token.end], loc: loc }); } return token; } function lex() { var token; token = lookahead; index = token.end; lineNumber = token.lineNumber; lineStart = token.lineStart; lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advanc